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Litmus is a testing service for web and marketing professionals. It allows people to cross-browser test their websites, and test their email newsletters across a range of email clients and spam filters. | 250ok is an email deliverability tools company that produces a Software‐as‐a‐Service (“SaaS”) platform to monitor and measure the deliverability of email networks. These networks consist of companies sending various forms of messages including marketing, transactional, share, and others from various platforms. |
You send us a copy of your email design, either by uploading the HTML or sending us a test email. Within a couple of minutes you'll see screenshots of your email as it's rendered by all the different email clients. Made a change? One click starts a re-test.;PREVIEW IN REAL EMAIL CLIENTS- Litmus shows you screenshots of your email newsletter as it looks across all major email clients.;CHECK ON MOBILE DEVICES- See your email on the most popular mobile devices. Litmus even lets you realistically scroll your email on the device.;EVERYTHING IN ONE PLACE- We preview your message on every major mobile device and email client.;LIGHTNING-FAST- If you're trying to fix a rendering problem in your campaign, the last thing you want is to wait for your previews. We run hundreds of servers to ensure our system is the fastest in the industry.;WORKS WITH ANY EMAIL PROVIDER- Litmus is the perfect complement to your email marketing program. As an independent company, our email testing tools are compatible with any email provider, so there's no need to switch. | Inbox Informant
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Email on Acid is the most affordable, self-serve email testing platform in the world. We can help you maximize the success of your email marketing efforts by diagnosing and improving your renderability, deliverability, click-throughs and conversions.

We offer one platform that covers all email-related needs in one place: testing, sending, and in-depth tracking to control how email infrastructure works and performs.

Disposable email and fake email capture for QA and development teams

Mailinator is a disposable email service that allows QA departments to test with 1000's of inboxes.

Sidemail is an all-in-one email delivery platform for startups that makes sending emails simple. It has everything for delivering and managing emails – email API, transactional emails, email marketing and automation, contact management, no-code email editor, email templates, subscribe forms, and more. Perfect for teams & developers that want reliable deliverability without the bloat. We're based in the EU and GDPR compliant.

MTN Email Verifier is a high-performance tool for ensuring that your email communications reach the right inboxes every time. With the rise of email marketing and automated outreach, maintaining a clean list of deliverable email addresses is crucial. MTN Email Verifier combines syntax validation, domain checks, and server-level SMTP verification to deliver a reliable, real-time solution.

Free email verifier & checker to validate email addresses instantly. Reduce bounces and verify emails in real time.

Protect your domain with Dmarclytics. Run free DMARC, SPF, and DKIM checks to stop spoofing, enhance email authentication, and improve deliverability with powerful monitoring tools.

Use AI to find prospects that need you, automatically craft personalized cold emails for each, and scale effortlessly

It is a free and open-source mail transfer agent that routes and delivers electronic mail. It is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support it.